Quickly switch between versions of software by using a symlink in Windows

selectver.ps1

#Requires -RunAsAdministrator

param($version)

$scriptDir = Split-Path (Get-Variable MyInvocation -Scope Script).Value.MyCommand.Path
Push-Location $scriptDir

$available = Get-ChildItem -Directory -Exclude "active"
$active = if (Test-Path "active") {Get-Item -Path "active"} else {$null}

if ($null -eq $version) {
    Write-Output "No target version given. Available versions are:"
    $available | ForEach-Object {
        if ($active.Target -eq $_) {
            Write-Host "* " -NoNewline
        }
        Write-Output $_.Name
    }
    return
}

if ($available.Name -notcontains $version) {
    Write-Error "The requested version is not available."
    return
}

Write-Debug "Setting new symlink"
$link = New-Item -ItemType SymbolicLink -Path "active" -Target $version -Force

Write-Output $link.Target

Pop-Location